1.PopupWindow是一个可以显示在当前Activity之上的浮动容器,PopupWindow弹出的位置是能够改变的,按照有无偏移量,可以分为无偏移和有便宜两种:按照参照对象的不同又可以分为两种:相对某个控件(Anchor锚点)的位置和在父容器内部的相对位置. 显示PopupWindow的方法: showAsDropDown(Viewanchor) //相对某个控件的位置(正下方),无偏移 showAsDropDown(Viewanchor, int xoff, int yoff) //相…
原题连接:https://www.patest.cn/contests/pat-a-practise/1051 题目: Given a stack which can keep M numbers at most. Push N numbers in the order of 1, 2, 3, ..., N and pop randomly. You are supposed to tell if a given sequence of numbers is a possible pop seq…